protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            // This is optional. If you don't want to use Trackbars leave this away.
            //graph3D.AssignTrackBars(trackRho, trackTheta, trackPhi);

           // comboRaster.Sorted = false;
           // foreach (eRaster e_Raster in Enum.GetValues(typeof(eRaster)))
           // {
           //     comboRaster.Items.Add(e_Raster);
           // }
           // comboRaster.SelectedIndex = (int)eRaster.Labels;

           // comboColors.Sorted = false;
           // foreach (eSchema e_Schema in Enum.GetValues(typeof(eSchema)))
           // {
           //     comboColors.Items.Add(e_Schema);
           // }
            //comboColors.SelectedIndex = (int)eSchema.Rainbow1;

           // comboDataSrc.SelectedIndex = 0; // set "Callback"
        }

        private void LoadSurface()
        {
            #region int s32_Values definition

            int[,] s32_Values = new int[,]
            {
                { 34767, 34210, 33718, 33096, 32342, 31851, 31228, 30867, 31457, 30867, 30266, 28934, 27984, 26492, 25167, 25167, 25167},
                { 34669, 34210, 33653, 33096, 32539, 32047, 31490, 30933, 31293, 30671, 29983, 28803, 27886, 26492, 25167, 25167, 25167},
                { 34603, 34144, 33718, 33227, 32768, 32342, 31719, 30999, 31228, 30333, 29622, 28606, 27886, 26492, 25167, 25167, 25167},
                { 34472, 34079, 33653, 33161, 32768, 32408, 31785, 31162, 30802, 30048, 29360, 28312, 27755, 26367, 25049, 25049, 25049},
                { 34210, 33784, 33423, 33161, 32801, 32408, 31785, 31097, 30474, 29622, 29000, 28115, 27623, 26367, 25049, 25049, 25049},
                { 33980, 33587, 33161, 32935, 32588, 32342, 31621, 30802, 29852, 29000, 28377, 27689, 27421, 26367, 25049, 25049, 25049},
                { 33522, 33227, 32702, 32615, 32452, 31851, 30933, 30179, 29295, 28358, 27984, 27132, 27301, 26367, 25049, 25049, 25049},
                { 32672, 32178, 31916, 31469, 31246, 30540, 29852, 29065, 28377, 27623, 27263, 26706, 26935, 26367, 25049, 25049, 25049},
                { 30769, 30423, 29917, 29231, 29392, 28705, 28075, 27726, 27263, 26691, 26417, 26182, 26575, 26575, 25246, 25246, 25246},
                { 27525, 27518, 26701, 27334, 27682, 27402, 26903, 26707, 26444, 25887, 25719, 25690, 26122, 26122, 26122, 26122, 26122},
                { 23475, 23888, 24478, 25330, 26212, 26199, 25701, 25664, 25740, 25013, 24904, 25068, 25374, 25374, 25374, 25374, 25374},
                { 20677, 21445, 22544, 23593, 24441, 24785, 24538, 24644, 24773, 24299, 24062, 24576, 24510, 24510, 24510, 24510, 24510},
                { 18743, 19792, 20808, 22086, 22805, 23167, 23486, 23366, 23757, 23411, 23691, 23822, 23822, 23822, 23822, 23822, 23822},
                { 17334, 18579, 19497, 20775, 21463, 21848, 22288, 22446, 22643, 22446, 22643, 22708, 23069, 23069, 23069, 23069, 23069},
                { 16155, 17236, 18350, 19399, 20251, 20677, 21016, 21332, 21660, 21791, 21889, 21955, 22217, 22217, 22217, 22217, 22217},
                { 14746, 15860, 17039, 17990, 18842, 19595, 20050, 20349, 20546, 20840, 20972, 20972, 21332, 21332, 21332, 21332, 21332},
                { 13337, 14516, 15729, 16679, 17564, 18514, 18907, 19169, 19399, 19661, 19792, 19594, 20152, 20152, 20152, 20152, 20152},
                { 12452, 13435, 14615, 15499, 16253, 17105, 17596, 17924, 18153, 18285, 18428, 18776, 19104, 19104, 19104, 19104, 19104},
                { 11469, 12354, 13533, 14287, 15008, 15925, 16187, 16482, 16690, 16976, 17105, 17302, 17531, 17531, 17531, 17531, 17531},
                { 10486, 11370, 12255, 13009, 13861, 14746, 15172, 15368, 15434, 15630, 15794, 15991, 16351, 16351, 16351, 16351, 16351},
                {  9684, 10387, 11141, 11796, 12546, 13337, 14029, 14320, 14549, 14811, 14939, 15434, 15794, 15794, 15794, 15794, 15794},
                {  9059,  9634, 10617, 11141, 11838, 12681, 13411, 13861, 14121, 14624, 14868, 15172, 15368, 15368, 15368, 15368, 15368},
            };

            #endregion

            cPoint3D[,] i_Points3D = new cPoint3D[s32_Values.GetLength(0), s32_Values.GetLength(1)];
            for (int X = 0; X < s32_Values.GetLength(0); X++)
            {
                for (int Y = 0; Y < s32_Values.GetLength(1); Y++)
                {
                    i_Points3D[X, Y] = new cPoint3D(X * 10, Y * 500, s32_Values[X, Y]);
                }
            }

            // Setting one of the strings = null results in hiding this legend
            graph3D_View.AxisX_Legend = "X";
            graph3D_View.AxisY_Legend = "Force";
            graph3D_View.AxisZ_Legend = "Speed";

            // IMPORTANT: Normalize X,Y,Z separately because there is an extreme mismatch 
            // between X values (< 300) and Z values (> 30000)
            graph3D_View.SetSurfacePoints(i_Points3D, eNormalize.Separate);

            // *********************************
            // eSchema = 0, Autumn
            //         = 1, ColorCube
            //         = 2, Cool
            Color[] c_Colors = ColorSchema.GetSchema((eSchema)10);
            graph3D_View.SetColorScheme(c_Colors, 3);

            // *********************************
            // eRaster = 0, Off
            //         = 1, MainAxis
            //         = 2, Raster
            //         = 3, Labels
            graph3D_View.Raster = (eRaster)3;

            // *********************************
            graph3D_View.SetCoefficients(1350, 70, 230);
        }